71481381 has 16 divisors (see below), whose sum is σ = 99740160. Its totient is φ = 45480960.

The previous prime is 71481367. The next prime is 71481419. The reversal of 71481381 is 18318417.

It is not a de Polignac number, because 71481381 - 2¹¹ = 71479333 is a prime.

It is a super-2 number, since 2×71481381² = 10219175659334322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71481331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1525 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (6233760).

Almost surely, 2^71481381 is an apocalyptic number.

It is an amenable number.

71481381 is a deficient number, since it is larger than the sum of its proper divisors (28258779).

71481381 is a wasteful number, since it uses less digits than its factorization.

71481381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10636.

The product of its digits is 5376, while the sum is 33.

The square root of 71481381 is about 8454.6662264101. Note that the first 3 decimals coincide. The cubic root of 71481381 is about 415.0154946554.

Adding to 71481381 its reverse (18318417), we get a palindrome (89799798).

The spelling of 71481381 in words is "seventy-one million, four hundred eighty-one thousand, three hundred eighty-one".